Rika N.
Yelp
SUMO MUSEUM!!
This small museum (Actually it's more like a gallery. They only have one room. ) is located inside Ryogoku-Kokugikan.
They show the history of Sumo and collection of Sumo-related stuff like cloth. pictures, trophies...etc.
If you are a Sumo fan, you will enjoy here so much. It not, yeah, you can learn something about Sumo at least. The admission is FREE, so it's worth to take a look if you are strolling around this area.
My favorite part was portraits of legendary Sumo-wrestlers. Did you know that a big part of top Sumo-wrestlers are not from Japan? They are from Mongolia, Hawaii, Guam, Bulgaria (The guy was wearing Mawashi (belt) sponsored by Yogurt company!) ... everywhere! Now Sumo became very international.
Caution: They are closed on Weekends and Holidays!